code: def extract_signature(func, ignore_first=False):
      """Extract the function signature from the function.
  
      Args:
          func: The function whose signature should be extracted.
          ignore_first: True if the first argument should be ignored. This should
              be used when func is a method of a class.
  
      Returns:
          List of Parameter objects representing the function signature.
      """
      signature_parameters = list(
          get_signature(func).parameters.values()
      )
  
      if ignore_first:
          if len(signature_parameters) == 0:
              raise ValueError(
                  "Methods must take a 'self' argument, but the "
                  f"method '{func.__name__}' does not have one."
              )
          signature_parameters = signature_parameters[1:]
  
      return signature_parameters
  
file_path: ray/python/ray/_private/signature.py
imports: import inspect
  import logging
  from inspect import Parameter
  from ray._private.inspect_util import is_cython
label_desc: Use image node_id 2 for calling a global function with example usage: extract_signature(func, ignore_first) and returns: signature_parameters